Red Sox pitcher Chris Sale has been admitted to Massachusetts General Hospital for a stomach illness, according to the team.
The Red Sox made the announcement Sunday night in the seventh inning of Game 2 of the AL Championship Series against Houston.
Boston said Sale reported the illness earlier in the day.
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Sale entered the hospital Sunday afternoon and will be kept overnight for evaluation.
The 29-year-old pitcher missed Game 2 of the American League Championship Series against the Houston Astros at Fenway Park Sunday night.
Sale struggled with his control in Boston's 7-2 loss to the Astros in the series opener Saturday night. He allowed two runs with four walks and a hit batter in four innings despite giving up just one hit.
Sale picked up the win in Game 1 of the AL Division Series against the Yankees when he pitched into the sixth inning. He also threw a perfect eighth inning in the clincher at Yankee Stadium on Tuesday night.
Sale missed nearly six weeks, making just one start, from late July into September with mild left shoulder inflammation before he worked his way back into the rotation with four starts in September.
The team said in a tweet Sunday night that it will provide further updates when available.